Chemistry 9th Chap 11 : Topic 5 - Maryam Publications

Chemistry Chapter 11 : Topic 5

Sulfur and Acid Rain

1 / 20

How does sulfur present in fossil fuels contribute to the formation of acid rain?

A) It burns to form sulfur dioxide, which later forms acids in the atmosphere.

B) It directly reacts with oxygen to form water vapour.

C) It converts into oxygen gas during combustion.

D) It neutralizes atmospheric moisture.

2 / 20

Which gas produced during combustion of sulfur-containing fuels is primarily responsible for acid rain?

A) Carbon monoxide

B) Oxygen

C) Sulfur dioxide

D) Nitrogen gas

3 / 20

What is the correct sequence of chemical transformation leading to acid rain formation from sulfur emissions?

A) SO₂ → O₂ → H₂O

B) SO₂ → SO₃ → H₂SO₄

C) S → O₂ → CO₂

D) H₂O → SO₂ → O₃

4 / 20

Why is sulfur dioxide considered an environmental pollutant?

A) It enhances photosynthesis.

B) It forms sulfuric acid in the atmosphere causing acid rain.

C) It increases oxygen concentration in air.

D) It reduces atmospheric pressure.

5 / 20

Which process in the atmosphere converts sulfur dioxide into sulfur trioxide?

A) Condensation with water vapor

B) Reduction by oxygen

C) Neutralization with ammonia

D) Oxidation in presence of oxygen and catalysts

6 / 20

What is the primary acid formed when sulfur dioxide reacts with atmospheric moisture?

A) Nitric acid

B) Carbonic acid

C) Sulfuric acid

D) Hydrochloric acid

7 / 20

Which environmental effect is most directly linked with acid rain caused by sulfur compounds?

A) Reduction in global temperature

B) Increase in soil fertility

C) Corrosion of buildings and monuments

D) Increase in oxygen levels in water bodies

8 / 20

How does acid rain affect aquatic life in lakes and rivers?

A) It neutralizes water bodies completely.

B) It increases oxygen levels in water.

C) It increases fish reproduction.

D) It lowers pH, making water toxic for aquatic organisms.

9 / 20

Which property of sulfur dioxide makes it dangerous for long-range environmental impact?

A) It can travel long distances in the atmosphere.

B) It remains localized near emission sources only.

C) It is insoluble in air.

D) It instantly converts to oxygen.

10 / 20

Which material is most vulnerable to damage from sulfur-based acid rain?

A) Limestone and marble buildings

B) Plastic polymers

C) Rubber tires

D) Glass containers

11 / 20

What happens when sulfur dioxide dissolves in rainwater?

A) It forms alkaline solution.

B) It produces oxygen gas.

C) It forms neutral solution.

D) It forms acidic solution.

12 / 20

Which reaction correctly represents acid rain formation from sulfur dioxide?

A) SO₂+H₂O → NaOH

B) SO₂+CO₂ → HCl

C) SO₂+O₂+H₂O → H₂SO₄

D) SO₂ → O₂+H₂

13 / 20

Why does acid rain damage soil fertility?

A) It leaches essential nutrients from soil.

B) It increases organic matter content.

C) It converts soil into rock.

D) It increases nitrogen fixation.

14 / 20

Which human activity is the major source of sulfur dioxide emissions?

A) Evaporation of water bodies

B) Photosynthesis in plants

C) Burning of fossil fuels in power plants

D) Respiration in animals

15 / 20

How does sulfur contribute indirectly to respiratory problems?

A) By reducing air pressure

B) By producing nitrogen gas

C) By increasing oxygen levels in lungs

D) By forming acidic gases that irritate respiratory tract

16 / 20

Which statement best explains environmental impact of sulfur emissions?

A) They increase atmospheric oxygen.

B) They cause long-term acidification of ecosystems.

C) They improve plant growth.

D) They reduce rainfall completely.

17 / 20

Why are forests affected by acid rain?

A) It increases photosynthesis rate.

B) It enhances water absorption in roots.

C) It increases chlorophyll production.

D) It damages leaves and reduces nutrient uptake from soil.

18 / 20

Which step is essential in transforming sulfur dioxide into acid rain components?

A) Reduction of SO₂ into sulfur

B) Condensation of oxygen

C) Evaporation of water vapor

D) Oxidation and hydration of SO₂

19 / 20

Why is sulfur considered more harmful in fossil fuels compared to inert gases?

A) It cools down atmosphere.

B) It increases oxygen levels.

C) It remains completely unreactive.

D) It forms acidic pollutants after combustion.

20 / 20

What is the long-term environmental consequence of continuous sulfur dioxide emissions?

A) Stabilization of climate

B) Restoration of ecosystems

C) Acidification of soil and water bodies

D) Increase in biodiversity

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